package com.backup.information;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * 将UP头像使用流输出到路径
 * @author 司啸飞
 * @create 2021-05-13 13:28
 */
public class GetImage {
    static final File FIlE = new File(".\\image\\face\\face.jpg");

    public static void getPortrait(String mid) throws Exception {
        // 防止image文件夹丢失
        if (FIlE.exists() == false) {
            new File(".\\image\\face").mkdirs();
        }
        // 调用方法,获取UP个人信息的map
        MyGetJson my = new MyGetJson(mid);
        URL url = new URL(my.getJsonObject().getString("face"));

        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        //设置请求方式为"GET"
        conn.setRequestMethod("GET");
        //超时响应时间为5秒
        conn.setConnectTimeout(5 * 1000);
        //通过输入流获取图片数据
        InputStream inStream = conn.getInputStream();
        //得到图片的二进制数据，以二进制封装得到数据，具有通用性
        byte[] data = readInputStream(inStream);
        //创建输出流
        FileOutputStream outStream = new FileOutputStream(FIlE);
        //写入数据
        outStream.write(data);
        inStream.close();
    }

    private static byte[] readInputStream(InputStream inStream) throws Exception {
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        //创建一个Buffer字符串
        byte[] buffer = new byte[1024];
        //每次读取的字符串长度，如果为-1，代表全部读取完毕
        int len = 0;
        //使用一个输入流从buffer里把数据读取出来
        while ((len = inStream.read(buffer)) != -1) {
            //用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度
            outStream.write(buffer, 0, len);
        }
        //关闭输入流
        inStream.close();
        //把outStream里的数据写入内存
        return outStream.toByteArray();
    }

}
